The Anomaly-Eating Keeper

To afford his ill mother's medical fees, Linden Vance becomes a lighthouse keeper on a remote island. The island is sinister. He hunts 'beasts' for survival. Unbeknownst to him, these 'beasts' are anomalies capable of destroying cities. Eating them transforms his body. When Linden Vance returns home, powerful entities are driven mad: this monster, whose aura can crush the void, is just a lighthouse keeper wanting his salary?!